In the Southern North Sea
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NOTES ON THE OCCURRENCE OF SOME POORLY KNOWN DECAPODA (CRUSTACEA) IN THE SOUTHERN NORTH SEA by J. P. H. M. ADEMA Rijksmuseum van Natuurlijke Historie, Leiden, The Netherlands F. CREUTZBERG & G. J. VAN NOORT Netherlands Institute for Sea Research, Texel, The Netherlands With 9 text-figures, 6 tables, 5 maps INTRODUCTION Since April 1972 an ecological trawl-survey programme has been undertaken by the Netherlands Institute for Sea Research (NIOZ), Texel, in the southern North Sea with the R. V. "Aurelia". The main object is to obtain information on distribution, density, biomass and fluctuations of crawling or swimming demersal (epibenthic) fauna such as small fishes, shrimps, prawns, crabs, asteroids, ophiuroids and some gastropods, for the evaluation of the role of these carnivores in the benthic ecosystem of the southern North Sea. Sedimentological aspects of the area are described by Creutzberg & Postma (1979). Within the context of the present paper the most important feature is the mesh of 5 x 5 mm2 of the cod end of the 51/2 m beam-trawl used and the extensive area of 5000-10,000 m2 covered during each haul. These exceptional circumstances resulted into faunistically interesting catches which gave rise to a cooperation with taxonomic specialists of the Rijksmuseum van Natuurlijke Historie (RMNH), Leiden. The present paper deals with decapod crustaceans, collected during "Aurelia"-cruises, which are considered to be scarce or rare in the southern North Sea, completed with data from bottom-samples and other sources. The species in question are: Pandalina brevirostris, Spirontocaris lilljeborgii, Alpheus macrocheles, Pontophilus spinosus, Pontophilus bispinosus, Galathea dispersa, Ebalia tuberosa, Ebalia tumefacta, Ebalia cranchii, Atelecyclus rotundatus, Monodaeus couchii, Callianassa subterranea, Callianassa tyrrhena, Upogeb ia stellata and Upogebia deltaura. Of the genus Macropodia a number of specimens have been collected, which partly were identified as M. linaresi. Other specimens, however, represent one or two new species. On Macropodia in the southern North Sea a seperate paper will be published (Van Noort & Adema, in preparation). Family PANDALIDAE Haworth, 1825 Pandalina brevirostris (Rathke, 1837) (table 1) Pandalina brevirostris; Holthuis, 1950: 33, fig. 19. Heerebout, 1974: 79, fig. 5. Van Leeuwen, 1975: 17, figs. 30, 32, 34, 35. Holthuis & Heerebout, 1976: 10, 27, fig. 15. Van Noort, Van Leeuwen & Creutzberg, 1979a: 10; 1979c: 10, 48; 1979d: 10. Van Noort & Creutzberg, 1981: 9, 48. 10 ZOOLOGISCHE BIJDRAGEN 28 (1982) TABLE 1 Distribution of Pandalina brevirostris in the southern North Sea 2 Date position Station number per 1000 m 3.V.1972 52°31 'N 02°46* Ε 94 2.6 17.x. 1972 53°35FN 04° 29' Ε 179 18 17.x.1972 53°43»N 04° 17' Ε 180 36 17.x.1972 54°06'N 04° 00' Ε 182 1.0 17.x.1972 54°25'N 03° 30' Ε 185 0.7 18.x.1972 54°30'Ν 03° 20 Ε 186 0.2 18.x.1972 54°08'N 02° 2 7 Ε 192 2.7 18.x.1972 54°00FN 02° 30 Ε 193 0.6 19.x.1972 53°08FN 04° 00 Ε 201 3.6 24.x.1972 52°20'N 03°23 Ε 209 0.5 25.x.1972 52°48!N 02° 4 7 Ε 21 1 9.0 25.x.1972 52°46'Ν 02° 31 Ε 212 129 25.x.1972 52°39!N 02° 30 Ε 213 22.7 25.x.1972 52°36FN 02°46 Ε 214 2.9 25.x.1972 52°32'Ν 03° 30 Ε 216 0.2 30.x.1972 53°18FN 03°49 Ε 228 35.7 31.χ.1972 53°18!N 02° 48 Ε 232 1.8 31.x.1972 52°15FN 02° 35 Ε 235 6.8 31.x.1972 52°53FN 02°47 Ε 236 2.8 31.x.1972 53°00FN 03° 10 Ε 238 2.1 30.i.1973 54°29'N 03°37' Έ 252 7.2 31.i.1973 54°06FN 02°32 Έ 260 0.4 l.ii.1973 53°19'Ν 03°51 Έ 273 1.2 6/ii. 1973 53°11 !N 03° 14 "Ε 283 38.4 8.Ü. 1973 52°36!N 04° 17 Έ 286 2.0 14.x.1974 53°I8'N 03°48 Έ 293 0.3 14.x.1974 53°22!N 03°41 »Ε 294 3.6 15.x.1974 54°43'N 00°06 'W 296 0.1 15.x.1974 54°57'Ν 00°26 FW 298 3.6 15.x.1974 55°05'N 00° 35 FW 299 0.6 17.x.1974 55°26FN 00°29 fE 305 1. 1 17.x.1974 55°14FN 00°42 fE 306 0.5 17.x.1974 54°55'N 01°21 'Ε 309 0.3 17.x.1974 54°45'N 01°45 fE 310 1. 1 18.x.1974 53°36FN 04°25 fE 323 2.7 ADEMA, CREUTZBERG & VAN NOORT, DEC APODA 11 According to Holthuis (1950) Pandalina brevirostris (Rathke) is known from the following localities in the southern North Sea: Helgoland, Margate, the Deepwater-Channel and the Dover Strait. The species should be rather scarce in the southern North Sea; it has one time been found 20 miles off the coast of Walcheren, Zeeland, approximately at 5Γ3ΓΝ 03°10'E (Heerebout, 1974; Holthuis & Heerebout, 1976). The species however, has frequently been found in the southern North Sea during the "Aurelia"-cruises; the results of the first five cruises are listed in table 1 (after Van Leeuwen, 1975; Van Noort, Van Leeuwen & Creutzberg, 1979a, c & d; Van Noort & Creutzberg, 1981). On 27.ix. 1980 a single specimen of P. brevirostris was collected in the Oosterschelde near Flauwers, on the island of Schouwen, province of Zeeland, the Netherlands (leg. J. C. Post). This appeared to be the first record of this species within the Dutch territorial waters. The specimen forms part of the col lection of the Leiden Museum. Family HIPPOLYTIDAE Bate, 1888 Spirontocaris lilljeborgii (Danielssen, 1859) (fig. 1) Spirontocaris lilljeborgii; Holthuis, 1950: 43, fig. 14. One specimen of Spirontocaris lilljeborgii (Danielssen) was collected on 9.x. 1975 at 53°00'N 04°37'E (Sta. 352), near the south-west coast of the island of Texel. This is the first record of this species for the Netherlands. According to Holthuis (1950) the species could be expected in Dutch waters. Fig. 1. Spirontocaris lilljeborgii, length 62 mm (after Holthuis, 1950). 12 ZOOLOGISCHE BIJDRAGEN 28 (1982) Family ALPHEIDAE Bate, 1888 Alpheus macrocheles (Hailstone, 1835) Alpheus macrocheles; Smaldon, 1979: 48, fig. 16. Four specimens of Alpheus macrocheles (Hailstone) were collected during the "Aurelia"-cruises; these are the first records of this species for the entire North Sea. The species is known from the Channel; in Great Britain it is recorded as far as Portland, at the south-coast (Smaldon, 1979). The specimens were col• lected on 25.ii.1976 at 52°48'N 02°34'E (Sta. 411, 1 ex.) and at 52°33'N 02°43'E (Sta. 413, 3 ex.). Family CRANGONIDAE Haworth, 1825 Pontophilus spinosus (Leach, 1815) Pontophilus spinosus; Holthuis, 1950: 83, fig. 28. Smaldon, 1979: 112, figs. 41d, 50. During the "Aurelia"-cruises three specimens of Pontophilus spinosus (Leach) were collected in the southern North Sea: one specimen on 18.xi. 1974 at 53°49.5'N 04°05'E (Sta. 325), the two others on 16.X.1975 at 53°35.5'N 03°10'E (Sta. 369) and 53°40'N 03°25'E (Sta. 370). The locality of Sta.325 is situated 45 miles north-west of the island of Texel; the species has not been recorded before from so close to the Dutch coast. In the southern North Sea P. spinosus is known from the coast of Northumberland, Great Yarmouth, the White Bank, the Dogger Bank and Helgoland (Holthuis, 1950); according to Smaldon (1979) the species has been found along all British coasts. The specimen of Sta. 325 forms part of the collection of the Leiden Museum, the two others are in the collection of the Netherlands Institute for Sea Research. Pontophilus bispinosus Hailstone, 1835 (tables 2-4) Pontophilus bispinosus; Holthuis, 1950: 84, figs. 29, 30. Van Leeuwen, 1975: 17, figs. 8, 30, 31, 32, 35. Van Noort, Van Leeuwen & Creutzberg, 1979a: 10; 1979b: 10; 1979c: 10. Van Noort & Creutzberg, 1981: 9. According to Holthuis (1950) Pontophilus bispinosus Hailstone is known from the following localities in the southern North Sea: the Dogger Bank, Helgoland, Borkum, the Deep Hole, the Deepwater-Channel and from a locality IV2 mile north-west of the lightship "Terschellingerbank". The species has frequently been found in the southern North Sea during the "Aurelia"-cruises; the results of the first five cruises are listed in table 2 (after Van Leeuwen, 1975; Van Noort, Van Leeuwen & Creutzberg, 1979a, b, c; Van Noort & Creutzberg, 1981). The collection of the Leiden Museum holds a few specimens collected in the southern North Sea (table 3) and also a few specimens from the stomaches of fishes caught in the same area (table 4). ADEMA, CREUTZBERG & VAN NOORT, DECAPODA 13 TABLE 2 Distribution of Pontophilus bispinosus thine southern North Sea 2 Date position station number per 10 000 m 25.iv.1972 5 4° 30• N 02°32 !E 64 14 25.iv.1972 54°28 !N 02°23 Έ 65 1 26.iv.9172 53°52 'N 02°30 Έ 69 13 26.iv.1972 53° 18 fN 02°28 fE 73 6 28.iv.1972 52°54 •N 04°28 Έ 82 0 2.v.1972 52°51 fN 03°42 Έ 88 1 4.v.1972 52°34 •N 03°41 Έ 102 144 4.V.1972 52°30 'N 03° 18 fE 105 230 28.VÜ.